LEASES - Maturity of Lease Liabilities, Lessee (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Leases
2019 (remaining six months ending December 31, 2019)	$ 42,116
2020	65,810
2021	46,334
2022	33,184
2023	16,897
Thereafter	21,354
Total lease payments	225,695
Less: Imputed Interest	(16,361)
Present value of lease liabilities	209,334	$ 210,806
Finance Leases
2019	7,239
2020	11,465
2021	9,720
2022	7,007
2023	4,601
Thereafter	13,703
Total lease payments	53,735
Less: Imputed Interest	(9,382)
Present value of lease liabilities	44,353
Total
2019 (remaining six months ending December 31, 2019)	49,355
2020	77,275
2021	56,054
2022	40,191
2023	21,498
Thereafter	35,057
Total lease payments	279,430
Less: Imputed Interest	(25,743)
Present value of lease liabilities	$ 253,687	$ 258,258